Ask three people in a packaging chain what a 500 ml bottle holds and you get three answers, all correct. The bottle has three capacities, and only one of them reaches the carton.
The 3 Volumes and Who Needs Each
| Volume | What it measures | Who works from it |
|---|---|---|
| Brimful | Everything the glass holds, level with the finish. | Your glass supplier, and any capacity verification. |
| Nominal | The trade size your product is sold as. | Your label, your marketing and your customs entry. |
| Fill point | The level your filler actually works to. | Your filling line and your quality checks. |
Why Brimful Is the Only Physical Number
Brimful is a property of your bottle. It can be measured by water fill and weight, it can be verified on receipt, and it does not change with what you put inside.
The other two are decisions. Nominal is a name and the fill point is a setting, so an argument about capacity is nearly always an argument about which of the three someone meant. SGSBOTTLE verifies capacity by water-fill weight as routine across the 14 lines in Shandong and Xuzhou.
Where the Confusion Costs a Run
A filler set from the nominal figure overfills, because the bottle is bigger than its name. A closure applied to an overfilled 250 ml (8.5 oz) bottle traps no headspace, and a hot-filled one then has nowhere for the vacuum to form.
Underfilling is the other direction and worse commercially. A label claim you cannot meet is a regulatory problem rather than a production one, and it surfaces at an inspection rather than on your line.
Brimful is measurable; the rest are decisions. SGSBOTTLE verifies capacity across 14 lines in Shandong and Xuzhou.
Tolerances Belong on All Three
Glass varies, so brimful capacity carries a tolerance and your specification should state it. A bottle at the top of its range and one at the bottom present your filler with different headspace from the same pallet.
That spread is why a fill point set with no margin fails intermittently. Ask for the brimful tolerance with the drawing, and set your fill point so both extremes still work.
What to Write on Your Specification
Four figures rather than one. Brimful capacity with its tolerance, the nominal size, the fill point, and the headspace that results at both ends of the tolerance.
Written that way, your specification is testable. SGSBOTTLE states brimful and nominal capacity with tolerances on the drawing for glass from the 14 lines in Shandong and Xuzhou, so an incoming check has something to measure against.
What Goes on Your Enquiry
Your target fill in ml and oz, your product and fill temperature, your closure and sealing method, and your filling line type. SGSBOTTLE comes back with the brimful capacity, the tolerance and a recommended fill point for your order.